Method for producing a workpiece

Abstract

A method for producing a workpiece includes: placing a workpiece holder on a base support of a support system with a positioning element in an additive manufacturing device, the lower side of the workpiece holder having a first positioning device, the positioning element and first positioning device forming a pin/hole pair; performing additive manufacture of a workpiece on the workpiece holder using the manufacturing device, the temperature of the support system increasing, producing a clamping effect between the pin and the hole; cooling the support system, whereby the clamping effect is released; disengaging the workpiece holder together with the workpiece produced thereon from the base support; and arranging the workpiece holder on a support of an installation for the subtractive post-processing of the workpiece wherein a positioning element of the support and the positioning device of the workpiece holder engage in each other.

1 . A method for producing a workpiece, comprising:
 placing a workpiece holder on a base support of a support system in an additive manufacturing device,   wherein the base support is arranged to be secured in a process chamber of the manufacturing device and comprises at least one positioning element;   wherein the workpiece holder has a lower side and a building side as an upper side which is located substantially opposite the lower side,   wherein the lower side of the workpiece holder has at least one first positioning device for releasable, positionally accurate attachment to the base support of the support system,   the at least one positioning element and the at least one first positioning device are designed in a complementary manner and form a pin/hole pair comprising a pin and a hole,   at least one section of the pin is made of a first material having a first thermal expansion coefficient, and a retaining section of the hole that is decisive for the positioning accuracy is made of a second material having a second thermal expansion coefficient, and   wherein the second thermal expansion coefficient is lower than the first thermal expansion coefficient such that a clamping effect results between the pin and the surrounding hole in the event of a temperature increase of the support system during the manufacturing process due to the expansion of the section of the pin, or   wherein the first thermal expansion coefficient is lower than the second thermal expansion coefficient such that a clamping effect results between the pin and the surrounding hole in the event of a temperature increase of the support system during the manufacturing process due to the expansion of the retaining section of the hole;   said method comprising carrying out an additive manufacture of a workpiece on the workpiece holder by use of the manufacturing device, the temperature of the support system increasing during the manufacturing process and a clamping effect resulting between the pin and the surrounding hole due to the expansion of the section of the pin or due to the expansion of the retaining section of the hole,   cooling the support system, whereby the clamping effect is released;   disengaging the workpiece holder together with the workpiece produced thereon from the base support; and   arranging the workpiece holder on a support of an installation for the subtractive post-processing of the workpiece wherein a positioning element of the support and the positioning device of the workpiece holder engage in each other.   
     
     
         2 . The method according to  claim 1 , further comprising, prior to placing the workpiece holder on the support of the installation for subtractive post-processing:
 placing the workpiece holder on a support of an installation for thermal post-processing of the workpiece.   
     
     
         3 . The method according to  claim 1 , wherein the step of disengaging comprises:
 gripping, by means of a gripper, the workpiece holder at a gripping means arranged on a lateral surface of the workpiece holder.   
     
     
         4 . The method according to  claim 1 , wherein a plurality of workpiece holders are arranged side by side on the base support of the manufacturing device. 
     
     
         5 . A method for producing a workpiece according to an additive manufacturing process, comprising:
 determining a position and/or orientation of the workpiece to be produced relative to a workpiece holder on which the workpiece is additively manufactured while taking into account digital part data defining a geometry of the workpiece and while taking into account conditions defined by a subtractive post-processing step of the workpiece;   carrying out the additive manufacture of the workpiece on the workpiece holder based on the determined position and/or orientation of the workpiece.   
     
     
         6 . The method according to  claim 5 , further comprising:
 determining a support geometry that includes at least one support structure for the workpiece while taking into account the conditions defined by the subtractive post-processing of the workpiece,   wherein the step of carrying out the additive manufacture includes the additive manufacture of the support structure.   
     
     
         7 . The method according to  claim 5 , wherein the conditions defined by the subtractive post-processing of the workpiece include at least one of the following conditions: milling forces of the tools used for the subtractive post-processing, milling torques of the tools used for the subtractive post-processing, vibrations during the subtractive post-processing, attainability of the geometry of the workpiece and/or the support structure by the tools used for subtractive post-processing, machine kinematics of the tools used for the subtractive post-processing, tool geometry of the tools used for the subtractive post-processing, and tool linking of the tools used for the subtractive post-processing. 
     
     
         8 . The method according to  claim 5 , further comprising:
 configuring a possible building space of a manufacturing device for the additive manufacture of the workpiece.   
     
     
         9 . The method according to  claim 1 , further comprising:
 determining a layer thickness of the additive manufacture and/or determining an exposure strategy for the additive manufacture while taking into account the digital part data defining a geometry of the workpiece and while taking into account the conditions defined by the subtractive post-processing of the workpiece.   
     
     
         10 . A method for producing a workpiece according to an additive manufacturing process, comprising:
 determining a position and/or orientation of the workpiece to be produced relative to a workpiece holder on which the workpiece is additively manufactured while taking into account digital part data defining a geometry of the workpiece and while taking into account conditions defined by a subtractive post-processing step of the workpiece;   carrying out the additive manufacture of the workpiece on the workpiece holder based on the determined position and/or orientation of the workpiece, wherein the method further comprises providing support system for the additive manufacturing device, comprising:   a base support that is arranged to be secured in a process chamber of the manufacturing system and comprises at least one positioning element; and   a workpiece holder on which a workpiece can be produced according to a manufacturing process including the layered application of a raw material in powder form, wherein   the workpiece holder has a lower side and a building side as an upper side which is located substantially opposite the lower side,   on the lower side, the workpiece holder has at least one first positioning device for releasable, positionally accurate attachment to the base support of the support system,   the at least one positioning element and the at least one first positioning device are designed in a complementary manner and form a pin/hole pair comprising a pin and a hole,   at least one section of the pin is made of a first material having a first thermal expansion coefficient, and a retaining section of the hole that is decisive for the positioning accuracy is made of a second material having a second thermal expansion coefficient, and   wherein the second thermal expansion coefficient is lower than the first thermal expansion coefficient such that a clamping effect results between the pin and the surrounding hole in the event of a temperature increase of the support system during the manufacturing process due to the expansion of the section of the pin, or   wherein the first thermal expansion coefficient is lower than the second thermal expansion coefficient such that a clamping effect results between the pin and the surrounding hole in the event of a temperature increase of the support system during the manufacturing process due to the expansion of the retaining section of the hole;   and wherein the workpiece holder is the workpiece holder of the support system.